RFR: 8355476: RISC-V: using zext_w directly in vector_update_crc32 could trigger assert

[Hamlin Li]

Hi,
Can you help to review this simple patch?
zext_w uses Zba directly, which could cause issue on machine without Zba supports or when Zba is disabled manually.

Thanks!

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Commit messages:
 - initla commit

Changes: https://git.openjdk.org/jdk/pull/24846/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24846&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8355476
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/24846.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24846/head:pull/24846

PR: https://git.openjdk.org/jdk/pull/24846